It doesn't make any difference whether you type capitals or small letters. However, make sure not to make any typos, and observe accent marks and other marks.
When you type in several words, you will get every document in which these words are in exactly the same order. For example: synthetic peptides
When you type AND between the words, you will get every document in which all these words occur. For example: food AND hygiene AND refrigeration technology
When you use OR, you will get every document in which at least one of the specified words occurs. For example: oil OR pipeline OR offshore close
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